<!DOCTYPE HTML>  
<html>  
  <head>  
    <title>My WebSocket</title>  
     <script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.js" ></script> 
<script >  
var websocket = null;
  function login(){
  	$.ajax({
  		url:"http://localhost:8080/spring_learning/login/method",
  		type:"get",
  		success:function(data){
  			if(data>1){
  				websocket.send("down");
  				$("#wel").hide();
  			}
  			else{
  				$("#wel").show();
  			}
  		}
  	});
  }
  $(function(){
	
	    
      
      //判断当前浏览器是否支持WebSocket  
      if('WebSocket' in window){  
          websocket = new WebSocket("ws://localhost:8080/spring_learning/websocket");  
      }  
      else{  
          alert('Not support websocket')  
      }
      //连接发生错误的回调方法  
      websocket.onerror = function(){  
          setMessageInnerHTML("error");  
      };  
         
      //连接成功建立的回调方法  
      websocket.onopen = function(event){  
          setMessageInnerHTML("open");  
      }  
         
      //接收到消息的回调方法  
      websocket.onmessage = function(event){  
          setMessageInnerHTML(event.data);  
      }  
         
      //连接关闭的回调方法  
      websocket.onclose = function(){  
          setMessageInnerHTML("close");  
      }  
         
      //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。  
      window.onbeforeunload = function(){  
          websocket.close();  
      }  
         
      //将消息显示在网页上  
      function setMessageInnerHTML(innerHTML){  
          alert(innerHTML);
      }  
         
      //关闭连接  
      function closeWebSocket(){  
          websocket.close();  
      }  
         
      //发送消息  
      function send(){  
          var message = document.getElementById('text').value;  
          websocket.send(message);  
      }  
  });
      
  </script>  
  </head>  
     
  <body>  
  <!--  <form action="" id="login">
   		username:<input type="text" />
   		password:<input type="password" />
   		submit:<input type="submit"/>
   </form> -->
  	<button onclick="login()">login</button>
   <h3 id="wel" style="display:none">welcome</h3>
  
    
  </body>  
 
 
</html>  